2020 **Abstract:** We present the first laser spectroscopic measurement of the neutron-rich nucleus 68 Ni at the N = 40 subshell closure and extract its nuclear charge radius. Since this is the only short-lived isotope for which the dipole polarizability αD has been measured, the combination of these observables provides a benchmark for nuclear structure theory. We compare them to novel coupled-cluster calculations based on different chiral two-and three-nucleon interactions, for which a strong correlation between the charge rad…

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“…These values are in excellent agreement with independent measurements reported in [35]. Negligible deviations from our values in [18] arise from a correction in the analysis code but lead only to insignificant changes of δ r Theory. -Ab initio approaches compute the meansquare charge radius r 2 c starting from the calculated point-proton mean-square radius r 2 p ,…”

supporting

confidence: 92%

“…These values are in excellent agreement with independent measurements reported in [35]. Negligible deviations from our values in [18] arise from a correction in the analysis code but lead only to insignificant changes of δ r Theory. -Ab initio approaches compute the meansquare charge radius r 2 c starting from the calculated point-proton mean-square radius r 2 p ,…”

supporting

confidence: 92%

“…Results are listed in Table I. The changes in mean-square nuclear charge radii δ r 2 c 60,A ≡ r 2 c A − r 2 c 60 are obtained using the field-shift factor F = −783(94) MHz/fm 2 and the massshift factor M α=396 = 950(5) GHz u, as explained in [18]. These values are in excellent agreement with independent measurements reported in [35].…”

supporting

confidence: 81%

“…Immediately after its inception, this approach was used to for the first ab initio calculations of dipole response and the related photodisassociation cross section of medium-mass closed-shell nuclei [241,242]. More recently, it was used to compute the electric dipole polarizability α D of nuclei like 48 Ca [243,244,246] and 68 Ni [247]. Together with measurements of the charge radius, this quantity can be used to constrain ab initio calculations that will in turn allow the theoretical extraction of the neutron point radius as well as the thickness of the neutron skin.…”

confidence: 99%